Abstract
Positive and negative chemical ionization mass spectra have been obtained for sulfuric acid using methane as either the reactant gas or as the moderating gas. The only positive ions which could be attributed to sulfuric acid were due to the protonated molecular ions and these ions had very low intensities. In contrast there were many ions which could be attributed to sulfuric acid and its fragments and some of these ions were intense. A preliminary investigation is reported on the use of negative ion chemical ionization mass spectrometry for quantitative analysis. Various methods of sample introduction and source temperatures were investigated and the optimum conditions provided a limit of detection of 100 ng of sulfuric acid.
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